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/*
* Copyright (C) 2023 Apple Inc. All rights reserved.
* Copyright (C) 2012 the V8 project authors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#pragma once
#include "StringSplitCache.h"
namespace JSC {
inline JSImmutableButterfly* StringSplitCache::get(const String& subject, const String& separator)
{
AssertNoGC assertNoGC;
if (!subject.impl() || !subject.impl()->isAtom())
return nullptr;
if (!separator.impl() || !separator.impl()->isAtom())
return nullptr;
auto* subjectImpl = static_cast<AtomStringImpl*>(subject.impl());
auto* separatorImpl = static_cast<AtomStringImpl*>(separator.impl());
unsigned index = subjectImpl->hash() & (cacheSize - 1);
{
auto& entry = m_entries[index];
if (entry.m_subject == subjectImpl && entry.m_separator == separatorImpl)
return entry.m_butterfly;
}
{
auto& entry = m_entries[(index + 1) & (cacheSize - 1)];
if (entry.m_subject == subjectImpl && entry.m_separator == separatorImpl)
return entry.m_butterfly;
}
return nullptr;
}
inline void StringSplitCache::set(const String& subject, const String& separator, JSImmutableButterfly* butterfly)
{
AssertNoGC assertNoGC;
if (!subject.impl() || !subject.impl()->isAtom())
return;
if (!separator.impl() || !separator.impl()->isAtom())
return;
auto* subjectImpl = static_cast<AtomStringImpl*>(subject.impl());
auto* separatorImpl = static_cast<AtomStringImpl*>(separator.impl());
unsigned index = subjectImpl->hash() & (cacheSize - 1);
{
auto& entry1 = m_entries[index];
if (!entry1.m_subject) {
entry1.m_subject = subjectImpl;
entry1.m_separator = separatorImpl;
entry1.m_butterfly = butterfly;
} else {
auto& entry2 = m_entries[(index + 1) & (cacheSize - 1)];
if (!entry2.m_subject) {
entry2.m_subject = subjectImpl;
entry2.m_separator = separatorImpl;
entry2.m_butterfly = butterfly;
} else {
entry2.m_subject = nullptr;
entry2.m_separator = nullptr;
entry1.m_subject = subjectImpl;
entry1.m_separator = separatorImpl;
entry1.m_butterfly = butterfly;
}
}
}
}
} // namespace JSC
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